KR100314850B1 - Method for measuring and recording thermal image of hot object - Google Patents

Abstract

PURPOSE: A method for measuring and recording the thermal image of a hot object is provided to properly manage a fireproof material embedded in a torpedo ladle car and to accurately measure and record a thermal image of an outer wall of the torpedo ladle car while a moving speed is maintained. CONSTITUTION: Plural decision points(K1-K25) are determined corresponding to the outer figure of a heating object. The thermal image is processed only when the temperatures of the decision points are within a predetermined range of temperature. The processed thermal image is recorded in a recorder.

Description

How to measure and record the thermal image of the heating object

The present invention relates to a method for measuring and recording a thermal image of an exothermic object, and in particular, to appropriately measure and record a thermal image of an outer wall of a torpedo ladle car for transporting hot molten iron produced in a blast furnace to a converter. The present invention relates to a method for measuring and recording a thermal image of a heating element.

The torpedo-shaped torpedo car transporting the molten iron has a refractory embedded therein. If the internal refractory is defective or improperly installed, the refractory is locally eroded, which may cause the charter to leak. In addition, since the parts of the molten iron which are in contact with the slag and the parts of the molten iron which are in contact with the molten iron are more likely to wear out of the refractory than other parts, it is necessary to repair the internal refractories before excessive wear occurs.

Conventionally, the visual inspection of the inner wall of Topedo car was performed to check the condition of wear of internal refractories, but it requires a lot of time to prepare for the inspection because it must be observed in the state of removing the molten iron and lowering the temperature. Reduces productivity and the inspection work is very laborious.

Therefore, a method of measuring the outer wall temperature distribution of topedoca and determining the abnormally high temperature portion as the worn portion of the internal refractories is also performed. Infrared cameras are used to measure the temperature distribution of the top wall of Topedo, and torpedoes are operated by stopping the toppedo to bring the toppedo into the field of view of the infrared camera, or by operating the shutter at low speed. By detecting a car with an optical sensor or the like and operating a shutter, a method of analyzing a thermal image by measuring the thermal image through an image processing apparatus is performed.

However, there is a problem in that time loss occurs in order to stop the toppedo or travel at a low speed, and manpower must be secured to operate the shutter. In addition, when an optical sensor is used, a false signal due to a topedoca shape may be generated, and when a plurality of topedocas are connected to each other, it may be difficult to recognize each topedoca. In order to increase the reliability of the optical sensor, it is necessary to arrange several optical sensors by trial and error, and thus there are many problems such as complicated device configuration or complicated maintenance of the sensor.

The present invention has been proposed to solve the above problems, by measuring the temperature distribution of the outer wall of the Torpedo Ladle Car to determine the abnormally high portion as the hand portion of the internal refractories, topedo It is an object of the present invention to provide a method for measuring and recording a thermal image of an exothermic object which automatically measures and records a torpedo car outer wall thermal image by identifying only the torpedo car during normal driving without stopping the car or driving at a low speed.

In addition, an object of the present invention is to provide a method for measuring and recording a thermal image of an exothermic object for appropriately measuring and recording the distribution of the outer wall temperature of the entire exothermic object that is not only toppedoca.

1 is a schematic diagram showing a device configuration of a first embodiment according to the present invention.

Fig. 2 shows the determination point set during the thermal image of the Torpedo Ladle Car.

FIG. 3 shows the arrangement of pixels at each determination point of FIG. 2.

Fig. 4 is a schematic diagram showing the device configuration of the second embodiment according to the present invention.

Fig. 5 shows the decision points set during the thermal image of Topedoca.

FIG. 6 shows the arrangement of pixels at each determination point of FIG. 5.

FIG. 7 illustrates recognition function values according to time in the thermal imaging based on FIGS. 4 to 6.

Fig. 8 is a flowchart showing the operation of the thermography and recording system of the outer wall of the toppedocar in the second embodiment.

Explanation of symbols on the main parts of the drawings

1: infrared camera 1A: infrared camera

1B: Infrared Camera 2: Thermal Imager and Recorder

3: topedoca 4: locomotive

5A: Light sensor (light emitter) 5B: Light sensor (light receiver)

6A: Light sensor (light emitter) 6B: Light sensor (light receiver)

7: body number recognition antenna 8: road

9: truck, car

As a specific means for achieving the above object, the thermal image measuring and recording method of the heating element according to the present invention sets a plurality of determination points in response to the appearance of the heating object in the thermal image measured by the infrared camera and sets the thermal image. The basic feature is that the measured thermal image is image-processed and recorded in the recording device only when the temperatures of the respective determination points obtained from the above are within the preset temperature range.

In addition, the number of pixels of the determination point is set to be larger than the number of pixels of the thermal image of the heating object in which the infrared camera reads the thermal image one frame, and at the same time, the specific value in each pixel temperature of the determination point obtained from the thermal image is determined. The second feature is that the temperature of the point is set and the measured thermal image is image-processed and recorded in the recording apparatus only when the temperatures of the determination point are all within a preset temperature range.

Then, the number of pixels of the determination point is set to be larger than the number of pixels of the thermal image of the heating object which the infrared camera moves between reading one frame, and the highest value of each pixel temperature of the determination point obtained from the thermal image is determined for each determination point. The third feature is that the measured thermal image is image-processed and recorded in the recording apparatus only when the temperatures of the determination points are all within the preset temperature range.

Furthermore, if there are a plurality of running heating elements and different infrared cameras measuring thermal images of these heating elements, a detection sensor for detecting in advance that the running heating objects are within the field of view of the infrared camera which should measure the thermal images of each heating element. It is a 4th characteristic that it arrange | positions on the running figure of a heat generating object.

In the thermography recording method of a heating element according to the present invention, the traveling heating object is a Torpedo Ladle Car, or the traveling heating object is a Topedo Car, and in this case, the preset temperature range is 200. It shall be -500 degreeC.

For example, the present invention is explained by using a heating object as a topedoca. First, the distance from the topedoca of the infrared camera is determined so that one portion of the topedoca traveling through the front is brought into the field of view of the infrared camera. Continuously measure the thermal image.

In the field of infrared cameras for continuous measurement of thermal images, high-temperature steel is loaded when there are roads in the rear of the rails through which torpedo cars travel and pass in front of infrared cameras in addition to toppedo cars. A truck or the like travels frequently. The locomotive itself, which towed Topedoca, is also a heating object. Under these circumstances, the top wall thermal image is distinguished from the toppedoka and other heating objects, and the toppedoka, which is connected to each other, is identified at a specific location within the field of view of the infrared camera, for example, when the toppedoka reaches the center. Measure and record.

Referring to the configuration and operation of the embodiment according to the present invention with reference to the accompanying drawings as follows.

Figure 1 shows one embodiment of a preferred device configuration for the measurement and recording of thermal images according to the present invention. As shown in Fig. 1, a plurality of torpedo cars 3 are towed by a locomotive 4 to travel on a rail. The infrared camera 1 is installed at a position where one topedoca is in a suitable size and enters the field of view. 2 is an image processing and recording apparatus for processing and recording the measured thermal image. This configuration does not change even if there is only one topedoca. 8 is a road behind a rail, and the truck, the car 9, etc. which loaded the heat generating object, such as high temperature steel, come and go.

Identification of the heat generating object according to the present invention is performed by combining the shape of the heat generating object and the outer wall temperature range. In the thermal image measured by the infrared camera, a plurality of determination points corresponding to the appearance of the heating object are set. Fig. 2 shows the decision points set corresponding to the toppedo shape in the torpedo car thermal image measured by the infrared camera. For example, 25 judgment points K1 to K25 are set in this thermal image.

Fig. 3 shows the arrangement of pixels at each determination point in Fig. 2, and each determination point is composed of, for example, horizontal 5, vertical 3, and 15 pixels in total (thermal image constituent pixels). The specific value in temperature T1,1 -T5,3, for example, the highest value (max, Ti, j) is made into the temperature Tk of the said determination point.

The outer wall temperature of topedoca is generally about 200 to 300 ° C. when the thickness of the refractory is large. However, when the thickness of the refractory increases and the thickness decreases, it increases to about 400 to 500 ° C. Only when it is in the temperature range of 500 ° C, it is recognized that Topedoca is within the field of view of the infrared camera and the measured thermal image is recorded in the image processing and recording apparatus.

Specifically, for each judgment point K, when the Tk of each judgment point K is within the set temperature range of 200 to 500 ° C, Uk = 1 and when outside the range of 200 to 500 ° C, the decision function is set to Uk = 0. When X = ∑Uk = 25, X is recognized as a recognition function in the whole judgment point, and it is recognized that Topedoca is inside the infrared camera, and if X <25, it is not recognized as Toppedo. The thermal image shall be measured.

An infrared camera can measure the thermal image of 10 frames (still image which becomes a unit which comprises a moving image) every second. Topedoca's traveling speed is about 1m / sec, so Topedoca moves 10cm between infrared cameras measuring one frame of thermal imaging. Install an infrared camera so that the body of the toppeda's body is full on the screen.

For example, a thermal image is composed of 320 pixels wide and 240 pixels high. Therefore, the size of one pixel is 1500cm / 320 = 4.6cm, and the moving distance of the toppedo is 10cm / 4.6cm. = 2.1 pixels. Therefore, the toppedo camera is measured during the one-frame thermal image measurement by setting the number of pixels at the determination point in the driving direction of the toppedo camera to be larger than the number of thermal image pixels of the heating object that the infrared camera moves between reading the thermal image one frame. You can avoid being affected by the movement. For example, the number of pixels of the determination point is set to 3 pixels in width and 3 pixels in height.

Hereinafter, another embodiment of the present invention will be described.

Figure 4 is a schematic diagram showing the device configuration of another embodiment according to the present invention. As shown in FIG. 4, the topedoca 3 towed by the locomotive 4 travels alternately on lanes 1 and 2. Two infrared cameras 1A and 1B are arranged with rails interposed therebetween, and the top wall thermal images of the toppedo 3 which are towed by the locomotive 4 and pass through the infrared cameras 1A and 1B. Measure from both sides of (3). 2 is a thermal image processing and recording apparatus for processing and recording a thermal image signal obtained from an infrared camera.

In this case, the infrared camera 1A becomes the judging camera when the toppedo 3 travels on lane 1, and the infrared camera 1B makes the judging camera when the toppedo 3 runs on lane 2. Shall be.

The measurement of the wall temperature distribution of topedoca must be done when the topedoca (3) is loaded with molten iron and moved to the steel mill. 6B (receiver) and the torpedo car traveling in advance are detected before entering the field of view of the infrared camera which should measure the thermal image.

When the light sensors 5A and 5B detect the toppedocar, the infrared camera 1A is used as the judging camera, and when the light sensors 6A and 6B detect the toppedocar, the infrared camera 1B is used as the judging camera. . In the vicinity of the rail, a radio antenna 7 is provided in order to identify the body number of the toppedo car, and it is such that the measured thermal image data file corresponds to the toppedo car type and the identification number.

Fig. 5 shows a determination point set corresponding to the outer wall of the toppedo car during the thermal image of the toppedo car. Twelve judgment points were arranged in accordance with the toppedal appearance, and each judgment point was composed of nine pixels of three horizontally and three vertically as shown in FIG. Since the thermal image is 320 pixels wide and 240 pixels high, the arrangement coordinates of the determination points are shown in Table 1.

Decision Point No X coordinate Y coordinate 123456789101112 100260100140180220260100140180220260 8080 100 100 100 100 100 120 140 140 140 120

As described above, the size (pixel number) of the determination point, considering the moving distance (10 cm) of the torpedo car and the fuselage length (1500 cm) of the torpedo car, which move between measuring a thermal image of one frame as described above, The size of one pixel equivalent, 1500cm / 320pixels = 4.6cm / 1pixel, and the distance of 10cm of Topedoca moving between 1 frame thermal image is 10cm / 4.6cm / 1pixel = 2.1pixels. Therefore, the thermal image of one frame was set to 9 pixels of 3 widths and 3 lengths so as not to be influenced by the topedoca during the measurement.

7 is a recognition function X (X = ∑ Uk, Uk is a determination function according to time, when the thermal image of the top wall of the Topedoca is continuously measured by an infrared camera. Uk = 1 when the temperature obtained from the thermal image is in the range of 200 to 500 ° C, and Uk = 0 when out of the range of 200 to 500 ° C), and ① are signals of the locomotive towing topedoca, ②, ③ Is the signal of topedoca. ④ and ⑤ are noises other than topedoca such as cars and trucks traveling outside.

In the continuous measurement of the torpedo car outer wall thermal image, when the recognition function X is 12, the torpedo car passes through the center of the infrared camera screen, and accurately reads the thermal image of the outer surface of the torpedo car. ) Is recorded in the image processing and recording apparatus 2 together with the information. FIG. 8 is a flowchart showing the operation of the thermal image measuring and recording system of the toppedocar outer wall in the second embodiment. A is a toppedo driving on rail 1, and B is a toppedo driving on rail 2. First, the parameters such as the position of the judging pointer, the number of constituent pixels, and the topedoca identification temperature are set (S81). In order to check the entry of the toppedo car, the optical sensor is checked (S82). If the optical sensor A is on, the infrared camera 1A is used as the determination camera (S83A). The infrared camera 1B is used as the camera for determination (S83B). The infrared camera shoots 10 frames per second and has 320 * 240 pixels per frame. The thermal image of the judging camera is read by the image processing apparatus, the temperature Tk of each judging point is measured, and it is checked whether Tk is in the range of 200 to 500 占 폚 (S83). For each determination point, if the temperature Tk of the determination point is in the range of 200 to 500 ° C., the determination function value of Uk = 1 is set (S85A), and if it is outside the range of 200 to 500 ° C., the determination function value of Uk = 0 is set (S85B). ). Obtain the recognition function of X = ∑Uk against the determination function values set in S85A and S86B, compare the obtained recognition function X to 12 (S86), and if it is 12, save the thermal image of the infrared camera 1A or 1B and read the vehicle number. The measurement time is recorded as a header (S87). If the recognition function X is not 12, the steps of S84-S86 are repeated for the thermal image of the next frame.

According to the present invention, it is possible to accurately measure and record an outer wall thermal image of a heating heating object at a normal driving speed, so that the temperature of the outer wall is completely maintained, especially when applied to a traveling Torpedo Ladle Car. It can measure automatically and achieve the proper management of internal refractories.

Claims (6)

In the method of recording and measuring the thermal image of the outer wall of the heating object while driving, In the thermal image measured by the infrared camera, a plurality of determination points are set corresponding to the appearance of the heating object, and the thermal image measured only when the temperatures of each determination point obtained from the thermal image are all within a preset temperature range. Recording and recording on a recording device. The method of claim 1, Determining the specific value in each pixel temperature of the determination point obtained from the thermal image while setting the number of pixels of the determination point to be larger than the number of thermal image pixels of the heating object moving between reading the thermal image by one frame with the infrared camera. A method of measuring and recording a thermal image of a heating-up object, wherein the thermal image is recorded and recorded on the recording apparatus by measuring the thermal image only when the temperature of the point is all within the preset temperature range. The method of claim 1, The number of pixels of the determination point is set to be larger than the number of pixels of the thermal image of the heating object which the infrared camera moves between reading one frame, and the highest value of each pixel temperature of the determination point obtained from the thermal image is determined. A method of measuring and recording a thermal image of a heating-up object, wherein the thermal image is recorded and recorded on the recording apparatus by measuring the thermal image only when the temperature of the point is all within the preset temperature range. According to claim 1, wherein there are a plurality of traveling heating objects, and when the infrared cameras for measuring thermal images of the heating objects are different from each other, the traveling heating objects enter the field of view of the infrared camera to measure the thermal images of each heating object. A thermal image measuring and recording method for a heating object, characterized in that a detection sensor is disposed on a running diagram of the heating object in order to detect the problem in advance. The method of measuring and recording a thermal image of a heating object according to any one of claims 1 to 4, wherein the heating heating object is topedoca. The method according to claim 5, wherein the predetermined temperature range is 200 to 500 ° C.

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